M10 Nut Dimensions: Hex & Thin Series

Q: What size wrench or spanner do I need for an M10 nut?

Standard M10 hex nuts typically require a 17 mm wrench or socket (ISO 4032 standard). However, some older DIN 934 versions or specialized automotive M10 nuts may use a 16 mm wrench. Always verify the width across flats of your specific hardware.

Q: What is a jam nut?

A jam nut is a low-profile hex nut, typically from the Thin Series (DIN 439), that is used to lock a standard nut in place. By tightening a standard nut against a jam nut, you create internal tension between the threads of both nuts and the bolt. This “jams” the assembly together, providing a mechanical lock that prevents loosening caused by vibration or rotation.

Q: Can a Thin Series nut handle the same torque as a Regular nut?

No. Because the Thin Series has fewer threads in contact with the bolt, it has a lower proof load. Applying the high torque levels intended for a standard M10 structural bolt will likely strip the threads of a thin nut. Always use a standard height nut for primary load-bearing joints.

M10 nut dimensions or sizes are critical for automotive chassis, heavy machinery, and structural construction projects. This size is specifically engineered to mate with fasteners having a 10.00 mm nominal diameter and is available in M10 x 1.5 for the coarse series and M10 x 1.25 for the fine series.

This charts covers both the Regular Series (DIN 934 / ISO 4032) for standard load-bearing applications and the Thin or Half Series (DIN 439 / ISO 4035), which is ideal for jam nut or lock nut configurations or applications with limited vertical clearance. The thread dimensions comply with DIN 13-1 (coarse), DIN 13-21 (fine series), and ISO 68-1 standards to ensure a precise fit and reliable engagement across heavy-duty metric fastening systems.

Disclaimer: Actual dimensions, including the width across flats (spanner or wrench size), nut height, and thread tolerance may vary depending on the specific manufacturing class and material — always verify with the official product datasheet before use or buying.

Nut internal thread diagram depicting major diameter, minor diameter, and pitch diameter

Nut body diagram depicting width across flats, width across corners, diameter, and thickness or height

M10 x 1.5 Hex Nut – DIN 13-1/ISO 68-1
Dimension	Size (mm)
Dimension	Min	Max
Major Diameter	10	10.396
Pitch Diameter	9.026	9.206
Minor Diameter	8.376	8.676
Thread Pitch	1.5

M10 x 1.25 Hex Nut – DIN 13-21/ISO 68-1
Dimension	Size (mm)
Dimension	Min	Max
Major Diameter	10	10.34
Pitch Diameter	9.188	9.348
Minor Diameter	8.647	8.912
Thread Pitch	1.25

M10 x 1.0 Hex Nut – DIN 13-21/ISO 68-1
Dimension	Size (mm)
Dimension	Min	Max
Major Diameter	10	10.294
Pitch Diameter	9.35	9.5
Minor Diameter	8.917	9.153
Thread Pitch	1.0

M10 x 0.75 Hex Nut – DIN 13-21/ISO 68-1
Dimension	Size (mm)
Dimension	Min	Max
Major Diameter	10	10.24
Pitch Diameter	9.513	9.645
Minor Diameter	9.188	9.378
Thread Pitch	0.75

M10 Hex Nut – DIN 934/ISO 4032 & ISO 8673
Diameter	10	10.8
Width Across Flats	15.73	16
Width Across Corners	17.77	Not specified
Height / Thickness	8.04	8.4

M10 Thin / Half Nut – DIN 439/ISO 4035 & ISO 8675
Diameter	10	10.8
Width Across Flats	16.73	17
Width Across Corners	18.9	Not specified
Height / Thickness	4.7	5

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Frequently Asked Questions

What size wrench or spanner do I need for an M10 nut?

Standard M10 hex nuts typically require a 17 mm wrench or socket (ISO 4032 standard). However, some older DIN 934 versions or specialized automotive M10 nuts may use a 16 mm wrench. Always verify the width across flats of your specific hardware.

What is a jam nut?

A jam nut is a low-profile hex nut, typically from the Thin Series (DIN 439), that is used to lock a standard nut in place. By tightening a standard nut against a jam nut, you create internal tension between the threads of both nuts and the bolt. This “jams” the assembly together, providing a mechanical lock that prevents loosening caused by vibration or rotation.

Can a Thin Series nut handle the same torque as a Regular nut?

No. Because the Thin Series has fewer threads in contact with the bolt, it has a lower proof load. Applying the high torque levels intended for a standard M10 structural bolt will likely strip the threads of a thin nut. Always use a standard height nut for primary load-bearing joints.